9.9.9 Manual instructions - Advanced
The table below describes the advanced manual instructions available for ÄKTA pure.
DescriptionInstruction name
By using Pressure control the method can be run with the set
flow rate without the risk of method stop due to pressure alarm.
Pressure control is enabled in the instruction System flow or
Sample flow. Pressure control parameters provides the P and I
factors used in the regulator and can be adjusted for different
columns.
Pressure control parameters
Pressure control min flow rate can be set either as volumetric or
as linear flow. A column type must be selected before using linear
flow.
Constant pressure flow enables column packing at constant
pressure. The system pump automatically adjusts the flow rate
within the specified Minimum allowed flow rate – Maximum al-
lowed flow rate range. The goal is to reach and keep the set
Pressure at the selected Pressure sensor using the P and I factors
set in the Constant pressure flow parameters instruction. The
total volume is continuously updated using the actual flow rate.
Constant pressure flow
Both pressure control flow rates can be set either as volumetric
or as linear flow. A column type must be selected before using
linear flow.
Note:
•
When Constant pressure flow is used, the P and I factors set
in the Constant pressure flow parameters instruction are used
to control the pressure, instead of the P and I values set in the
Pressure control parameters instruction.
•
Pressure sensor Delta column pressure is available only when
column valve V9-C or V9H-C (5-columns) is selected in the
component list.
Constant pressure flow parameters sets the values for the P and
I factors needed to keep a constant pressure by varying the flow
rate. The signal used for pressure control is set in the instruction
Constant pressure flow.
Constant pressure flow param-
eters
484 ÄKTA pure User Manual 29119969 AB
9 Reference information
9.9 Manual instructions
9.9.9 Manual instructions - Advanced
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